Research shows that soymilk enriched with plant sterols and soluble fiber reduces LDL cholesterol by 5.5 mg/dL more than plain soymilk over 8 weeks. In a 2026 randomized controlled trial of 242 adults with high cholesterol, those drinking the enriched version daily had greater reductions in bad cholesterol compared to those drinking plain soymilk, according to Gram Research analysis.
Researchers tested whether soymilk with added plant sterols and fiber could lower cholesterol better than regular soymilk. Over 8 weeks, 242 adults with high cholesterol drank either plain soymilk or enriched soymilk twice daily. According to Gram Research analysis, the enriched version reduced LDL cholesterol (the bad kind) by about 5.5 mg/dL more than plain soymilk. This small but meaningful difference suggests that adding plant sterols and fiber to soymilk could be a tasty way to help manage cholesterol levels without medication.
Key Statistics
A 2026 randomized controlled trial of 242 adults found that enriched soymilk containing plant sterols and soluble fiber reduced LDL cholesterol by 5.5 mg/dL more than plain soymilk over 8 weeks.
In the study, the enriched soymilk group consumed 2 grams of plant sterols and 11.6 grams of total dietary fiber daily, with the cholesterol-lowering effect appearing gradually over the full 8-week period.
The enriched soymilk group showed significantly increased fiber intake compared to the plain soymilk group, with no significant differences in blood sugar levels, HDL cholesterol, triglycerides, or physical activity between groups.
The Quick Take
- What they studied: Whether soymilk with added plant sterols (cholesterol-like compounds from plants) and soluble fiber works better than plain soymilk for lowering LDL cholesterol, the bad kind that clogs arteries.
- Who participated: 242 adults aged 18 and older who had high LDL cholesterol levels (above 130 mg/dL). Some were not taking any cholesterol medicine, while others were already on stable cholesterol medications.
- Key finding: After 8 weeks, people drinking the enriched soymilk had LDL cholesterol that was 5.5 mg/dL lower than those drinking plain soymilk. This difference was statistically significant, meaning it was unlikely to happen by chance.
- What it means for you: If you have high cholesterol, switching to soymilk enriched with plant sterols and fiber might help lower your bad cholesterol levels. However, this should not replace any cholesterol medicine your doctor prescribed. Talk to your doctor before making dietary changes for cholesterol management.
The Research Details
This was a randomized controlled trial, which is the gold standard for testing whether something actually works. Researchers randomly assigned 242 adults with high cholesterol into two groups. One group drank plain soymilk (119 people), and the other group drank soymilk enriched with plant sterols and fiber (123 people). Both groups drank two 180-milliliter packs daily for 8 weeks, which is about the size of a small juice box.
The enriched soymilk contained plant sterols (2 grams per day total) and inulin, a type of soluble fiber (11.6 grams per day total). Both types of soymilk provided the same amount of soy protein (5 grams per serving). Researchers measured cholesterol levels and blood sugar at the start and at weeks 2, 4, 6, and 8. They also tracked what people ate and how much they exercised throughout the study.
The study was conducted from April 2013 to April 2014, and researchers used something called intention-to-treat analysis, which means they counted all 242 participants in the results, even the 3 people who stopped drinking their assigned soymilk early.
This study design is important because it reduces bias. By randomly assigning people to groups, researchers made sure the groups were similar at the start. This means any differences in cholesterol at the end were likely caused by the soymilk, not by other factors. Measuring cholesterol multiple times throughout the 8 weeks also helped researchers see how quickly the effect happened.
This study has several strengths. It included a large number of participants (242), which makes the results more reliable. It was published in a peer-reviewed journal, meaning other experts reviewed it before publication. The researchers tracked diet and exercise to make sure differences in cholesterol were not caused by people eating differently. However, the study only lasted 8 weeks, so we do not know if the benefits continue longer. Also, three people dropped out, which is normal but could slightly affect results.
What the Results Show
The main finding was clear: enriched soymilk lowered LDL cholesterol more than plain soymilk. After 8 weeks, the enriched soymilk group had LDL cholesterol levels that were 5.5 mg/dL lower than the plain soymilk group, even after adjusting for starting cholesterol levels. This difference was statistically significant, with a p-value of 0.028, meaning there is only about a 3 percent chance this happened by random luck.
Both groups started with similar cholesterol levels and similar diets. The enriched soymilk group consumed 2 grams of plant sterols and 11.6 grams of total dietary fiber daily from their soymilk. The plain soymilk group got the same soy protein but none of the added plant sterols or fiber.
The cholesterol-lowering effect appeared gradually over the 8 weeks rather than happening all at once. This suggests that the plant sterols and fiber needed time to work in the body. The effect was consistent across different measurements taken at weeks 2, 4, 6, and 8.
Researchers also looked at other cholesterol measures and health markers. They found no significant differences between groups in HDL cholesterol (the good kind), triglycerides (another type of blood fat), or total cholesterol. Blood sugar levels also stayed similar between groups. The enriched soymilk group did consume significantly more fiber overall, which was expected since their soymilk contained added fiber. However, there were no differences in total calories eaten, total fat eaten, or physical activity between the two groups.
This study builds on earlier research showing that plant sterols, soluble fiber, and soy protein each individually lower LDL cholesterol. This is the first study to combine all three in one product and test it in a controlled way. The 5.5 mg/dL reduction is smaller than what some studies found with plant sterols or fiber alone, but this may be because plain soymilk already contains soy protein, which has some cholesterol-lowering effect. The combination approach may be more practical for people because they get multiple benefits from one food.
The study lasted only 8 weeks, so we do not know if the benefits continue if people drink the enriched soymilk for months or years. The study included mostly adults with high cholesterol, so results may not apply to people with normal cholesterol levels. The 5.5 mg/dL reduction, while statistically significant, is modest and may not be enough on its own to bring cholesterol into a healthy range for everyone. Three participants dropped out early, though this is a small number. The study did not compare the enriched soymilk to cholesterol medications, so we cannot say whether it works as well as drugs. Finally, the study was conducted over a decade ago, so newer research might show different results.
The Bottom Line
If you have high LDL cholesterol, enriched soymilk with plant sterols and fiber may help lower it modestly. However, this should be part of a broader approach that includes a healthy diet, regular exercise, and any medications your doctor prescribed. The evidence is moderate strength because the effect is real but small. Talk to your doctor or a dietitian before making major dietary changes, especially if you are already taking cholesterol medication.
This research matters most for adults with high LDL cholesterol who are looking for dietary ways to improve their levels. It may be especially useful for people who already drink soymilk or are interested in plant-based foods. People who are vegetarian or vegan might find this particularly helpful. However, if you are allergic to soy or cannot tolerate soymilk, this approach will not work for you. People with very high cholesterol may still need medication in addition to dietary changes.
Based on this study, you should expect to see cholesterol changes within 2 to 4 weeks of regularly drinking enriched soymilk. The full effect appeared by week 8, so give it at least 8 weeks before deciding if it is working for you. Remember that cholesterol changes gradually, and individual results vary. Some people may see bigger improvements than others depending on their genetics and overall diet.
Frequently Asked Questions
Does enriched soymilk actually lower cholesterol?
Yes, research shows enriched soymilk with plant sterols and fiber reduces LDL cholesterol by about 5.5 mg/dL more than plain soymilk over 8 weeks. This is a modest but meaningful improvement that may help when combined with other healthy habits.
How much enriched soymilk should I drink daily to lower cholesterol?
The study used two 180-milliliter servings daily (about 12 ounces total). This amount provided 2 grams of plant sterols and 11.6 grams of fiber, which produced the cholesterol-lowering effect observed in the research.
Can enriched soymilk replace my cholesterol medication?
No, enriched soymilk should not replace prescribed cholesterol medication. The 5.5 mg/dL reduction is helpful but usually not enough on its own. Use it as an additional strategy alongside medication and other lifestyle changes recommended by your doctor.
How long does it take to see cholesterol improvements from enriched soymilk?
The study showed gradual improvements over 8 weeks, with changes appearing as early as weeks 2 to 4. Give it at least 8 weeks of consistent daily consumption before checking if your cholesterol has improved.
Does plain soymilk also lower cholesterol?
Plain soymilk contains soy protein, which has some cholesterol-lowering effect. However, the enriched version with added plant sterols and fiber works better, reducing cholesterol about 5.5 mg/dL more than plain soymilk.
Want to Apply This Research?
- Log your daily soymilk intake (plain versus enriched) and track your LDL cholesterol levels every 2 to 4 weeks. Record the specific brand and amount consumed to identify patterns between consumption and cholesterol changes.
- Set a daily reminder to drink two 180-milliliter servings of enriched soymilk (about 12 ounces total). Replace your current milk or beverage choice with this enriched version to make it a simple habit swap rather than adding extra calories.
- Check cholesterol levels every 4 to 8 weeks through your doctor or a home testing kit. Track trends over 8 to 12 weeks to see if the enriched soymilk is helping. Also monitor your overall diet quality and exercise to ensure you are making other heart-healthy changes alongside this dietary addition.
This research describes the effects of enriched soymilk on cholesterol levels in adults with high LDL cholesterol. These findings should not be considered medical advice or a substitute for treatment prescribed by your doctor. Cholesterol management requires a comprehensive approach including diet, exercise, and potentially medication. Before making significant dietary changes, especially if you are taking cholesterol-lowering medications or have other health conditions, consult with your healthcare provider or a registered dietitian. Individual results may vary based on genetics, overall diet quality, and lifestyle factors. This study lasted only 8 weeks, so long-term effects are unknown.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.